The Weekly Download: Coronavirus vaccine trial, winter weather whiplash

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Weekend TODAY’s Kristen Welker takes a look back at the biggest stories of the week, including drug giant AstraZeneca pausing its vaccine trials after a participant developed a serious inflammation of the spinal cord, the shake-up at the Rochester Police Department following the death of Daniel Prude and the extreme weather changes in Colorado that saw temperatures dropping as much as 60 degrees.